Horror Nun puts you inside a locked-down boarding school with one objective: get out before Sister Madeline finds you. This first-person stealth horror game blends puzzle-solving, exploration, and tense hide-and-seek survival into every attempt at freedom. You can play it free in your browser right now on PLRun — no download, no installation, just fear.

Set inside Eagle's Junior High School during the 1960s, Horror Nun follows a student lured to a summer camp that turns out to be a trap. Sister Madeline, the head of the nunnery, has kidnapped you — and the school's locked corridors, hidden rooms, and dark secrets stand between you and escape.

The premise draws loosely from the Evil Nun franchise originally created by Keplerians Horror Games, a Spanish indie studio behind titles with over 50 million downloads. What makes this free online game compelling is its restraint. There is no constant combat or scripted jump scares driving the tension.

Instead, Horror Nun relies on sound design, patrol patterns, and environmental puzzles to build dread. Multiple escape routes, hidden lore, a competitive leaderboard, and five difficulty levels give the game strong replay value as a browser game. Built with HTML5 (Unity WebGL), it loads instantly on desktop, mobile, and tablet without any additional software.

Horror Nun features two distinct modes with separate control layouts. The reference sources show slight variation in key bindings across platforms, so check the in-game tutorial if a key feels unresponsive. Escape Mode focuses on stealth and puzzle interaction: Some browser versions may map interact to E or left-click instead of F. If controls feel off, try both.